Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Characteristics on Evaporating Heat Transfer and Pressure Drop of HCs Refrigerants

탄화수소계 냉매의 증발 열전달 및 압력강하 특성

  • Lee Kwang-Bae (Refrigeration and Air-Conditioning Engineering, School of Mechanical Engineering, Pukyong National University) ;
  • Lee Ho-Saeng (Refrigeration and Air-Conditioning Engineering, School of Mechanical Engineering, Pukyong National University) ;
  • Kim Jae-Dol (Refrigeration and Air-Conditioning Engineering, Tongmyong College) ;
  • Yoon Jung-In (School of Mechanical Engineering, Pukyong National University)
  • Published : 2005.07.01
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Abstract

Experimental results for heat transfer characteristic and pressure gradients of HCs refrigerants R-290, R-600a, R-1270 and HCFC refrigerant R-22 during evaporating inside horizontal double pipe heat exchangers are presented. The test sections which has one tube diameter of 12.70 m with 0.86 mm wall thickness, another tube diameter of 9.52 mm with 0.76 mm wall thickness are used for this investigation. The local evaporating heat transfer coefficients of hydrocarbon refrigerants were higher than that of R-22. The average evaporating heat transfer coefficient increased with the increase of the mass flux. It showed the higher values in hydrocarbon refrigerants than R-22. Hydrocarbon refrigerants have higher pressure drop than R-22 in 12.7 mm and 9.52 mm. This results form the investigation can be used in the design of heat transfer exchangers using hydrocarbons as the refrigerant for the air- conditioning systems.

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References

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